Amps Atma-Sphere M-60 Mono blocks OTL design

You might have to upgrade or replace your current preamp that you are using at the moment since you will be missing the finest tubey sound.  If you have 8 ohms speaker that will work fine with M-60 but if you ask Ralph he recommend to use 8 and16 ohms speakers.  High end 16 ohms speaker such Classic with built-in horn mid range and tweeters are pricey.  The only alternative way to gain 16 ohms is through Zero transformers.

@bigboltz
The remote is nice, but I find the range is limited (10 feet or so). I have to contact Ralph and see if the remote needs batteries or if I need to situate the preamp differently.
I am glad to hear the M-60's have enough punch for quatro's. I was going to get them, but my, then 3a sigs were more power hungry, and he had a pair of upgraded MA-1 v2's for sale at a good price, so I went with those. I probably should have had the hi pass incorporated, in hindsight. Those stupid M5-HP's are not very attractive hanging off the inputs. @alexysflores 
Vandersteens are pretty stable with Atma-Sphere amps, more so when using the crossovers. I think Ralph says his amps should be good with even 4 ohm loads. 
@ozzy 
If Bigboltz is doing good with M60's, I am pretty sure you will be okay.
Of course the best info would be from Ralph himself. But, if Almarg says you have been using very little power with your current amp, then I wouldn't be concerned.-Ralph's designs are not only refined, but they are tough (as in, well built).
B

My MP-3 3.3 shipped on Friday. I'll have it Thursday.
My M60s are 3.1 and I'll send those in later this year. Gonna be a long 5 days!